package rara.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * <p>
 * VIEW페이지에서 서버로 요청시 한글에 대한 filter를 제공한다.
 * web.xml 설정파일에 정의되어 있다.</p>
 * --------------------------------------------------------<br>
 * <p>
 * 	<filter>
 * 		<filter-name>Character Encoding</filter-name>
 * 		<filter-class>com.daumsoft.common.filter.SetCharacterEncodingFilter</filter-class>
 * 		<init-param>
 * 			<param-name>encoding</param-name>
 * 			<param-value>UTF-8</param-value>
 * 		</init-param>
 * 	</filter>
 * 	<filter-mapping>
 * 		<filter-name>Character Encoding</filter-name>
 * 		<url-pattern>/*</url-pattern>
 * 	</filter-mapping>
 * </p>
 *
 * @author Bang, 2007. 08. 16
 * @version 1.0
 */
public class SetCharacterEncodingFilter implements Filter {
    /**
     * The default character encoding to set for requests that pass through this filter.
     */
    protected String encoding = null;
    
    
    protected String session = null;
    
    /**
     * The filter configuration object we are associated with.  If this value
     * is null, this filter instance is not currently configured.
     */
    protected FilterConfig filterConfig = null;

    /**
     * Should a character encoding specified by the client be ignored?
     */
    protected boolean ignore = true;

    /**
     * Take this filter out of service.
     */
    public void destroy() {

        this.encoding = null;
        this.session = null;
        this.filterConfig = null;

    }

    /**
     * Select and set (if specified) the character encoding to be used to
     * interpret request parameters for this request.
     *
     * @param request The servlet request we are processing
     * @param result The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain)
			throws IOException, ServletException {

        // Conditionally select and set the character encoding to be used
        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null)
                request.setCharacterEncoding(encoding);
        }
        
        //checking session
        /**
    	boolean isValid = false;
    	HttpSession sess = ((HttpServletRequest) request).getSession(false);
    	
    	if(sess != null) {
    		UserContainer userContainer = (UserContainer) sess.getAttribute(IConstants.USER_CONTAINER_KEY);
    		if(userContainer != null) {
    			User user  = userContainer.getUser();
    			if(user != null && user.getLoginId() != null) {
    				isValid = true;
    			}
    		}
    	}
    	**/

        // Pass control on to the next filter
        chain.doFilter(request, response);
    }

    /**
     * Place this filter into service.
     *
     * @param filterConfig The filter configuration object
     */
    public void init(FilterConfig filterConfig) throws ServletException	{

    	this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
		this.session = filterConfig.getInitParameter("session");
		String value = filterConfig.getInitParameter("ignore");
		if (value == null)
			this.ignore = true;
		else if (value.equalsIgnoreCase("true"))
			this.ignore = true;
		else if (value.equalsIgnoreCase("yes"))
			this.ignore = true;
		else
			this.ignore = false;
    }

    /**
     * Select an appropriate character encoding to be used, based on the
     * characteristics of the current request and/or filter initialization
     * parameters.  If no character encoding should be set, return
     * <code>null</code>.
     * <p>
     * The default implementation unconditionally returns the value configured
     * by the <strong>encoding</strong> initialization parameter for this
     * filter.
     *
     * @param request The servlet request we are processing
     */
    protected String selectEncoding(ServletRequest request) {
    	return (this.encoding);
    }
    
    protected String selectSession(ServletRequest request) {
    	return (this.session);
    }    
}
